坡度对上行通风火灾影响的数值模拟  

Numerical Simulation of the Influence of Slope on Upward Ventilation Fire

作　　者：索在斌 吴世跃[1] 牛煜[1] 陈瑾 SUO Zaibin;WU Shiyue;NIU Yu;CHEN Jin(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《煤矿安全》2019年第1期192-195,199,共5页Safety in Coal Mines

摘　　要：为探究上行通风时巷道坡度对矿井巷道火灾烟气流动的影响规律,应用火灾动力学模拟软件Pyrosim建立巷道线火源延燃模型,并依据美国职业安全与卫生研究所的全尺寸巷道火灾试验对模型参数有效性进行验证。基于以上参数,以山西省晋煤集团成庄某回风巷道为背景,建立了不同坡度上行通风巷道模型,对其火灾时期产生温度场和压力场进行数值模拟,分析巷道内部温度和压力分布,以及烟气蔓延规律。模拟结果显示:上行通风时巷道坡度增大,可使火灾初始蔓延速率加快,抑制烟气逆流的临界风速变小,同时火灾高温区域向下风侧偏移,温度整体下降,进出口压差增大。In order to investigate the influence of roadway slope on the smoke flow of fire in mine roadway during updraft ventilation, the fire dynamics simulation software Pyrosim was used to establish the flame propagation model of the roadway line and the effectiveness of the model parameters was verified based on the full-size roadway fire test conducted by Institute of Occupational Safety and Health in the United States. Based on the above parameters, a wind tunnel model with different gradients was established with the return airway of Chengzhuang Coal Mine in Shanxi Province, and the temperature and pressure fields generated during the fire were numerically simulated to analyze the temperature, pressure distribution and the spread of smoke inside the tunnel. The simulation results show that when the uphill roadway slope is increased during updraft ventilation, the initial rate of fire propagation can be accelerated, the critical wind speed to restrain the reverse flow of flue gas decreased. At the same time, the high-temperature fire area is shifted to the downwind side, the temperature decreases as a whole, and the pressure difference at the inlet and outlet increases.

关 键 词：矿井火灾 线火源 上行通风 巷道坡度 数值模拟 火灾蔓延 温度场 压力场 

分 类 号：TD752.2[矿业工程—矿井通风与安全]